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Northern LightsThe aurora borealis, or northern lights, fill the sky early Sunday, March 17, 2013, above the Holy Assumption of the Virgin Mary Russian Orthodox church in Kenai, Alaska. The bright display at times filled the sky. (AP Photo/M. Scott Moon)

Earth from SpaceThe moon is pictured above Earth in this handout photo courtesy of Col. Chris Hadfield of the Canadian Space Agency. REUTERS/CSA/Col. Chris (Hadfield/Handout)

South Severe Wea...Lightning steaks across the sky behind the Young Meadows Presbyterian Church in Montgomery, Ala., Monday, March 18, 2013. Strong storms moved across much of Alabama on Monday, bringing hail, high winds, and heavy rainfall as a cold front passed through the state. (AP Photo/Dave Martin)

Australia OperaFireworks explode in front of the Opera House during a performance of "Carmen" opera on the floating stage on Sydney Harbour in Sydney, Australia, Wednesday, March 20, 2013. Director Gale Edwards set Bizet's production in Spain under the rule of General Franco. (AP Photo/Rob Griffith)

'Lagrimas de Sao...A man looks at lightbulbs filled with water as part of the exhibition "Lagrimas de Sao Pedro" (Tears of Saint Peter) by Brazilian artist Vinicius Silva, at a cultural center in Rio de Janeiro, March 21, 2013. The artist used six thousand lightbulbs to create the idea of rain, showing the relationship between peasants and rain after singing and praying for Saint Peter to cry. International Water Day is held on March 22. (REUTERS/Pilar Olivares)

Nicaragua Animal...A man holds up his dog, dressed as a baby sitting in a stroller, close to a statue of Saint Lazarus, patron of the sick, during a ceremony at a church in the Monimbo neighborhood of Masaya, Nicaragua, Sunday, March 17, 2013. Catholics in Nicaragua associate Saint Lazarus with dogs, and dress up their pets for a Catholic blessing, asking the saint to keep their dogs healthy. (AP Photo/Esteban Felix)

Macedonia Strumi...A reveler participates in a carnival procession in the southeastern town of Strumica, Macedonia on Saturday, March 16, 2013. Some 3,000 disguised people participated Saturday, on the main carnival evening in Strumica. (AP Photo/Boris Grdanoski)

France Birth of ...This image released on Thursday March 21, 2013 by the European Space Agency (ESA) from the Planck spacecraft shows a bridge of hot gas that connects galaxy clusters about a billion light-years from Earth. (AP Photo/ESA Planck Collaboration)

St. Patrick's Da...Holding flags in memory of the 343 firefighters who lost their lives in the Sept. 11 attacks, members of the New York City Fire Department make their way up New York's Fifth Avenue as they take part in the St. Patrick's Day Parade Saturday, March 16, 2013. (AP Photo/Tina Fineberg)

Malaysia Aerobat...Aero Albatros jets of the Breitling Jet Team perform during an aerobatics display at the Subang Skypark near Kuala Lumpur, Malaysia, Saturday, March 16, 2013. Malaysia is the fourth stop of Breitling Asian Tour, making its debut in the country. (AP Photo/Vincent Thian)

Germany EasterColored and cooked eggs are pictured in a Easter egg dyeing company in Thannhausen near Augsburg, southern Germany, on Monday, March 18, 2013. Up to 200 000 eggs are being dyed in the company daily in pre Easter time. (AP Photo/Matthias Schrader)

South Africa Car...Performers as they take part in the Cape Town Carnival held in the city of Cape Town, South Africa, Saturday, March 16, 2013. Thousands of South Africans and tourist looked on as the yearly Cape Town Carnival took place with hundreds of performers taking part. (AP Photo/Schalk van Zuydam)

Singapore Russia...Children skate on a synthetic ice rink set against the backdrop of St Basil's Cathedral and the State Historical Museum in Moscow on Saturday March. 16, 2013 at the Changi International Airport in Singapore. This is part of the the airport's efforts in promoting overseas travel, this time being Russia.(AP Photo/Wong Maye-E)

Greece Clean Mon...People attempt to launch their kites on 'CleanMonday' at Filopappos hill with the ancient Parthenon temple seen in the background, Athens, Monday, March 18, 2013. Many Greeks commemorate 'CleanMonday', the first day of Lent, by flying kites and eating foods associated with fasting. (AP Photo/Petros Giannakouris)

St. Patrick's Da...A child takes part in a St Patrick's Day celebration in Bucharest, Romania, Sunday, March 17, 2013. (AP Photo/Vadim Ghirda)

Vatican PopeThe moon is seen behind a dome of St. Peter's Basilica at the Vatican, Saturday, March 16, 2013. Pope Francis offered intimate insights Saturday into the moments after his election, telling journalists that he was immediately inspired to take the name of St. Francis of Assisi because of his work for peace and the poor — and that he himself would like to see "a poor church and a church for the poor." (AP Photo/Dmitry Lovetsky)

Britain BudgetCampaigners, wearing masks, suits and holding copies of the traditional red ministerial box to represent Britain's Chancellor of the Exchequer George Osborne on budget day, prepare to pose for the media as part of a campaign event in Parliament Square, London, Tuesday, March 19, 2013. The event held Tuesday was organized by the "IF" campaign to coincide with the British Finance Minister delivering his annual budget speech to parliament on Wednesday. The "IF"campaign, which is a coalition of 170 charities, want the UK and G8 governments to increase agricultural aid spending to help fight poverty and hunger in developing countries. (AP Photo/Matt Dunham)

Philippines Stud...Students from the University of the Philippines, Manila form a "Justice" word with lighted candles Tuesday March 19, 2013 outside their campus in Manila, Philippines to mourn a fellow student Kristel Tejada, a 16-year-old freshman, who committed suicide Friday allegedly after being forced to take a leave-of-absence for her failure to pay her tuition. The students are blaming the Government for the alleged "commercialization" of education and in particular the "No late Payment" policy of the University which caused students to file a Leave of Absence if they cannot settle their accounts on time. (AP Photo/Bullit Marquez)

Koreas' TensionA North Korean soldier looks at the southern side through a pair of binoculars at the border village of the Panmunjom (DMZ) that separates the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Tuesday, March 19, 2013. The United States is flying nuclear-capable B-52 bombers on training missions over South Korea to highlight Washington's commitment to defend an ally amid rising tensions with North Korea, Pentagon officials said Monday.(AP Photo/Lee Jin-man)

Germany WeatherTwo people walk through the Tiergarten park after fresh snow falls hit Berlin, Germany, Tuesday, March 19, 2013. Unfriendly winter weather continues in northern and eastern Germany on the last day of winter. (AP Photo/Markus Schreiber)

Mahakumbh Mela F...In this Monday, March 18, 2013 photo, an Indian man walks past burning piles of garbage set afire at the end of the Mahakumbh mela festival at Sangam, the confluence of the Ganges, Yamuna and mythical Saraswati in Allahabad, India. The 55 days long festival, which is one of the world's largest religious gatherings, concluded earlier this month. (AP Photo/ Rajesh Kumar Singh)

Obama Visits Isr...US President Barack Obama reviews an honor guard upon his arrival at Ben Gurion airport near Tel Aviv, Israel, Wednesday, March 20, 2013. President Barack Obama is declaring common cause with Israel, highlighting the bonds between the United States and its Mideast ally. He says he has made Israel the first stop of the first trip of his second term to restate his commitment to Israel's security. (AP Photo/Ariel Schalit)

India FestivalIndian laborers prepare colored powder for the upcoming festival, ‘Holi’ in Allahabad, India, Wednesday, March 20, 2013. ‘Holi’, the festival of colors will be celebrated on March 27.(AP Photo/ Rajesh Kumar Singh)

Pope's Inaugurat...Pope Francis waves as he arrives in St. Peter's Square for his inauguration Mass at the Vatican, Tuesday, March 19, 2013. (AP Photo/Michael Sohn)

Germany Golden G...Torben Garlin of the C. Bechstein piano makers company tunes the Golden Grand Piano prior to its official presentation in Berlin, Wednesday, March 20, 2013. With the Golden Grand Piano the Berlin piano manufacture will celebrate their 160th anniversary. The Golden Grand Piano is built after a specification of a 19th century masterpiece made by the company's founder Carl Bechstein for the royal court of England. (AP Photo/Markus Schreiber)

Circus Elephant ...A performer waves as elephants with the Ringling Bros. and Barnum & Bailey show, pause for a photo opportunity on 3rd Street in front of the U.S. Capitol on their way to the Verizon Center, to promote the show coming to town, Tuesday, March 19, 2013, in Washington. (AP Photo/Alex Brandon)

San Francisco Fl...The San Francisco Flower & Garden Show is in full bloom opening the first day of Spring Wednesday, March 20th to the 24th, 2013 at the San Mateo Event Center. The third largest flower and garden show in the United States, this year's show puts a jaw-dropping spin on their spring festival by featuring the World's Largest Succulent Globe! It spins at a 23 degree angle like Earth, weighs in at 2800 pounds, is 14 feet high, 32.2 feet in circumference and is made of 30,000 succulent cuttings grown over 7 months. (PRNewsFoto/San Francisco Flower & Garden Show)

Polar Bear CubThis photo provided by the Alaska Zoo and taken March 13, 2013, in Anchorage, Alaska, shows Kali, an orphaned polar bear cub who is being cared for at the zoo. The cub's mother was shot in Point Lay, Alaska, on March 12 and the cub is temporarily staying at the zoo in Anchorage until it has a permanent home. (AP Photo/Courtesy the Alaska Zoo, John Gomes)

Spain Fallas Fes...Satirical sculptures are burned during the traditional Fallas Festival, in Valencia, Spain, early Wednesday, March 20, 2013. Every year the city of Valencia celebrates the ancient "Las Fallas" fiesta, a noisy week that is full of fireworks and processions in honor of Saint Joseph, burning large satiric figures displayed around the streets of the city. (AP Photo/Alberto Saiz)

Afghanistan Nowr...Hundreds of Afghans wait to see the holy flag at the Kart-e Sakhi mosque in Kabul, Afghanistan, Thursday, March 21, 2013. Afghanistan celebrates Nowruz, marking the first day of spring and the beginning of the year on the Iranian calendar. (AP Photo/Anja Niedringhaus)

Germany WeatherA stroller walks his dog while snow falls at the beginning of spring in Duisburg, Germany, Wednesday, March 20,2013. (AP Photo/Frank Augstein)

India World Wate...An Indian farmer fetches water from a pond to irrigate his cucumber plants on the eve of World Water Day in Allahabad, India, Thursday, March 21, 2013. The U.N. estimates that more than one in six people worldwide do not have access to 20-50 liters (5-13 gallons) of safe freshwater a day to ensure their basic needs for drinking, cooking and cleaning. (AP Photo/ Rajesh Kumar Singh)

Save Our Tigers ...A traditional tiger dancer from Orissa state waits to perform during a Save Our Tigers awareness campaign in Kolkata, India, Thursday, March 21, 2013. India’s latest tiger census counted at least 1,706 tigers in forests across the country. As many as 100,000 tigers are thought to have roamed India 100 years ago. (AP Photo/Bikas Das)

Spain Financial ...Workers from public transport unions demonstrate during a partial strike as they take part in a protest in Madrid, Wednesday, March 20, 2013. Madrid subway workers are staging a partial strike to protest wage cuts ordered by the Spanish government as part of efforts to trim an oversized budget deficit. (AP Photo/Daniel Ochoa de Olza)

Britain Royals L...Male tiger Jae Jae walks in a new 3.6 million pound Sumatran tiger enclosure after it was officially opened by Britain's Prince Philip, the Duke of Edinburgh, at London Zoo, north London, Wednesday, Mar. 20, 2013. (Photo by Joel Ryan/Invision/AP)

Germany Easter E...Volker Kraft decorates a tree with around 10,000 Easter eggs in their garden in Saalfeld, central Germany, Tuesday, March 19, 2013. The retired couple Christa and Volker Kraft have been decorating their tree at Easter for more than forty years. (AP Photo/Jens Meyer)

Philippines Prot...Protesters light candles and display placards during a rally Tuesday March 19, 2013 at the Philippine Supreme Court in Manila, Philippines to protest the highest court's issuance of a 120-day status quo ante order or a four-month delay of the implementation of the Reproductive Health Law which was signed by President Benigno Aquino III in December of last year. The protesters accused the 10 justices of the Supreme Court to be held "accountable to the 15 women and children who die each day" allegedly due to the non-implementation of the Reproductive Health Law. (AP Photo/Bullit Marquez)

India Lathmar Ho...In this photo taken Thursday, March 21, 2013, a Hindu man from the village of Nangaon throws colored powder on others as they sit on the floor during prayers at the Ladali or Radha temple before the procession for the Lathmar Holy festival, the legendary hometown of Radha, consort of Hindu God Krishna, in Barsana 115 kilometers ( 71 miles) from New Delhi, India , Thursday, March 21, 2013. During Lathmar Holi the women of Barsana beat the men from Nandgaon, the hometown of Krishna, with wooden sticks in response to their teasing as they depart the town. (AP Photo/Kevin Frayer)

Brazil Indigenou...An indigenous man wearing face paint and a headdress stands inside the abandoned old Indian museum in Rio de Janeiro, Brazil, Thursday, March 21, 2013. Brazilian Federal Court ruled that indigenous people who have been occupying the building since 2006 have to leave the area because it is next to the Maracana stadium, which will be the site of the final match of the 2014 World Cup soccer tournament and the opening and closing ceremonies of the 2016 Olympic games. Authorities say the compound must go as the area around the stadium is being transformed into a shopping and sports entertainment hub. (AP Photo/Felipe Dana)

Pakistan World W...A Pakistani woman, carrying bowls filled with water on her head, walks back to her home through a field on the eve of World Water Day, on the outskirts of Islamabad, Pakistan, Thursday, March 21, 2013. The U.N. estimates that more than one in six people worldwide do not have access to 20-50 liters (5-13 gallons) of safe freshwater a day to ensure their basic needs for drinking, cooking and cleaning. (AP Photo/Muhammed Muheisen)

Spring FlowersSpring flowers have snow on them after a brief snow squall in Manasquan, N.J., Thursday, March 21, 2013. (AP Photo/Mel Evans)